Operating instructions
~o
+20 V
FROM
-----?
>---J'v"0v-
........
----
........
------.------~
IF
GENERATOR
I
SELECTOR
I
:~1
1- - - -
--
I
I
I
I
~C'I
'T'
200PF
I
~~
L_
NOTE:
R3
8.2
K
R8
1.5K
R2
R'I
I
C3
27 K
Q2
1.8
K
.01
12V
I
r~GROUND
2N'I121
3.9V
- I
12V
Q1
2N35b5
3.7V
*R11
15
K
I
t---'W\r--t-----.---.j---Vll\r-<~
OUTPUT
*R7
D
CR1
R10
1N30b'l
I
b80
-.L
-
-=
Rb
I
C2
c:::::::::J
Yl
'170
.01
-=
-=-
J~
L..--
~
CH-A7
1.
RESISTORS
- 1/'IW.
5%
VALUES
IN
OHMS
UNLESS
OTHER~ISE
NOTED.
2.
CAPACITORS
-
VALUES
IN
~F
UNLtSS
OTHERWISE
NOTED.
3.
INDUCTORS
-
VALUES
IN
~H
UNLESS
OTHERWISE
NOTED.
'I.
*FACTORY
SELECT.
TYPICAL
VALUE
SHOWN.
5.
ALL
VOLTAGES
ARE
DC
UNLESS
OTHERWISE
NOTED.
b. C'I. 200pF IS
ADDED
WHEN
250
KHZ
OR
290
KHZ
CRYSTAL
IS
USED.
7.
CUSTOMER
REQUEST.
( 250
KHZ
TO
900
KHZ)
•
Figure
6-7.
IF-Oscillator
Board
(0105)
6-23/6-24